Sentinel seems to count netsplits as join/part floods ...
and sure, they are but ... here's how they can be made exempt
if user quits with 2 servers as quit message
add user name to flood-exempt list until matching *ickname* joins or 5 minutes
on join if user isin exempt list disregard
this is more cpu intensive, especially in big channels, and ESPECIALLY if the bot is on the wrong end ... but ehh ... its tolerable i think